Due to rounding error driver sometimes incorrectly calculate next packet size, which results in audible clicks on devices with synchronous playback endpoints. For example on a high speed bus and a sample rate 44.1 kHz it loses one sample every ~40.9 seconds. Fortunately playback interface on Scarlett 2i4 2nd gen has a working explicit feedback endpoint, so we can switch playback data endpoint to asynchronous mode as a workaround.
Signed-off-by: Alexander Tsoy alexander@tsoy.me --- sound/usb/quirks.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c index 6c2dfd3bfcbf..351ba214a9d3 100644 --- a/sound/usb/quirks.c +++ b/sound/usb/quirks.c @@ -1806,6 +1806,7 @@ void snd_usb_audioformat_attributes_quirk(struct snd_usb_audio *chip, */ fp->attributes &= ~UAC_EP_CS_ATTR_FILL_MAX; break; + case USB_ID(0x1235, 0x8200): /* Focusrite Scarlett 2i4 2nd gen */ case USB_ID(0x1235, 0x8202): /* Focusrite Scarlett 2i2 2nd gen */ case USB_ID(0x1235, 0x8205): /* Focusrite Scarlett Solo 2nd gen */ /*